regulator: Add Anatop regulator driver
authorYing-Chun Liu (PaulLiu) <paul.liu@linaro.org>
Wed, 14 Mar 2012 02:29:12 +0000 (10:29 +0800)
committerMark Brown <broonie@opensource.wolfsonmicro.com>
Wed, 14 Mar 2012 12:37:35 +0000 (12:37 +0000)
Anatop is an integrated regulator inside i.MX6 SoC.
There are 3 digital regulators which controls PU, CORE (ARM), and SOC.
And 3 analog regulators which controls 1P1, 2P5, 3P0 (USB).
This patch adds the Anatop regulator driver.

Signed-off-by: Nancy Chen <Nancy.Chen@freescale.com>
Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Reviewed-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
drivers/regulator/Kconfig
drivers/regulator/Makefile
drivers/regulator/anatop-regulator.c [new file with mode: 0644]

index c733df5d86652c3dc9935bd3c70715545f07f980..a229de98ae6f286171c3ce96ddb0d8d6f299108e 100644 (file)
@@ -102,6 +102,14 @@ config REGULATOR_DA9052
          This driver supports the voltage regulators of DA9052-BC and
          DA9053-AA/Bx PMIC.
 
+config REGULATOR_ANATOP
+       tristate "Freescale i.MX on-chip ANATOP LDO regulators"
+       depends on MFD_ANATOP
+       help
+         Say y here to support Freescale i.MX on-chip ANATOP LDOs
+         regulators. It is recommended that this option be
+         enabled on i.MX6 platform.
+
 config REGULATOR_MC13XXX_CORE
        tristate
 
index cf0934b598e0811cb85321420068511f139f6857..ab06474e5eb6881cca912bdf6b7e798c0be50167 100644 (file)
@@ -15,6 +15,7 @@ obj-$(CONFIG_REGULATOR_AAT2870) += aat2870-regulator.o
 obj-$(CONFIG_REGULATOR_AB3100) += ab3100.o
 obj-$(CONFIG_REGULATOR_AB8500) += ab8500.o
 obj-$(CONFIG_REGULATOR_AD5398) += ad5398.o
+obj-$(CONFIG_REGULATOR_ANATOP) += anatop-regulator.o
 obj-$(CONFIG_REGULATOR_BQ24022) += bq24022.o
 obj-$(CONFIG_REGULATOR_DA903X) += da903x.o
 obj-$(CONFIG_REGULATOR_DA9052) += da9052-regulator.o
diff --git a/drivers/regulator/anatop-regulator.c b/drivers/regulator/anatop-regulator.c
new file mode 100644 (file)
index 0000000..17499a5
--- /dev/null
@@ -0,0 +1,241 @@
+/*
+ * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/mfd/anatop.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+struct anatop_regulator {
+       const char *name;
+       u32 control_reg;
+       struct anatop *mfd;
+       int vol_bit_shift;
+       int vol_bit_width;
+       int min_bit_val;
+       int min_voltage;
+       int max_voltage;
+       struct regulator_desc rdesc;
+       struct regulator_init_data *initdata;
+};
+
+static int anatop_set_voltage(struct regulator_dev *reg, int min_uV,
+                                 int max_uV, unsigned *selector)
+{
+       struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
+       u32 val, sel;
+       int uv;
+
+       uv = min_uV;
+       dev_dbg(&reg->dev, "%s: uv %d, min %d, max %d\n", __func__,
+               uv, anatop_reg->min_voltage,
+               anatop_reg->max_voltage);
+
+       if (uv < anatop_reg->min_voltage) {
+               if (max_uV > anatop_reg->min_voltage)
+                       uv = anatop_reg->min_voltage;
+               else
+                       return -EINVAL;
+       }
+
+       if (!anatop_reg->control_reg)
+               return -ENOTSUPP;
+
+       sel = DIV_ROUND_UP(uv - anatop_reg->min_voltage, 25000);
+       if (sel * 25000 + anatop_reg->min_voltage > anatop_reg->max_voltage)
+               return -EINVAL;
+       val = anatop_reg->min_bit_val + sel;
+       *selector = sel;
+       dev_dbg(&reg->dev, "%s: calculated val %d\n", __func__, val);
+       anatop_set_bits(anatop_reg->mfd,
+                       anatop_reg->control_reg,
+                       anatop_reg->vol_bit_shift,
+                       anatop_reg->vol_bit_width,
+                       val);
+
+       return 0;
+}
+
+static int anatop_get_voltage_sel(struct regulator_dev *reg)
+{
+       struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
+       u32 val;
+
+       if (!anatop_reg->control_reg)
+               return -ENOTSUPP;
+
+       val = anatop_get_bits(anatop_reg->mfd,
+                             anatop_reg->control_reg,
+                             anatop_reg->vol_bit_shift,
+                             anatop_reg->vol_bit_width);
+
+       return val - anatop_reg->min_bit_val;
+}
+
+static int anatop_list_voltage(struct regulator_dev *reg, unsigned selector)
+{
+       struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
+       int uv;
+
+       uv = anatop_reg->min_voltage + selector * 25000;
+       dev_dbg(&reg->dev, "vddio = %d, selector = %u\n", uv, selector);
+
+       return uv;
+}
+
+static struct regulator_ops anatop_rops = {
+       .set_voltage     = anatop_set_voltage,
+       .get_voltage_sel = anatop_get_voltage_sel,
+       .list_voltage    = anatop_list_voltage,
+};
+
+static int __devinit anatop_regulator_probe(struct platform_device *pdev)
+{
+       struct device *dev = &pdev->dev;
+       struct device_node *np = dev->of_node;
+       struct regulator_desc *rdesc;
+       struct regulator_dev *rdev;
+       struct anatop_regulator *sreg;
+       struct regulator_init_data *initdata;
+       struct anatop *anatopmfd = dev_get_drvdata(pdev->dev.parent);
+       int ret = 0;
+
+       initdata = of_get_regulator_init_data(dev, np);
+       sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
+       if (!sreg)
+               return -ENOMEM;
+       sreg->initdata = initdata;
+       sreg->name = kstrdup(of_get_property(np, "regulator-name", NULL),
+                            GFP_KERNEL);
+       rdesc = &sreg->rdesc;
+       memset(rdesc, 0, sizeof(*rdesc));
+       rdesc->name = sreg->name;
+       rdesc->ops = &anatop_rops;
+       rdesc->type = REGULATOR_VOLTAGE;
+       rdesc->owner = THIS_MODULE;
+       sreg->mfd = anatopmfd;
+       ret = of_property_read_u32(np, "reg", &sreg->control_reg);
+       if (ret) {
+               dev_err(dev, "no reg property set\n");
+               goto anatop_probe_end;
+       }
+       ret = of_property_read_u32(np, "anatop-vol-bit-width",
+                                  &sreg->vol_bit_width);
+       if (ret) {
+               dev_err(dev, "no anatop-vol-bit-width property set\n");
+               goto anatop_probe_end;
+       }
+       ret = of_property_read_u32(np, "anatop-vol-bit-shift",
+                                  &sreg->vol_bit_shift);
+       if (ret) {
+               dev_err(dev, "no anatop-vol-bit-shift property set\n");
+               goto anatop_probe_end;
+       }
+       ret = of_property_read_u32(np, "anatop-min-bit-val",
+                                  &sreg->min_bit_val);
+       if (ret) {
+               dev_err(dev, "no anatop-min-bit-val property set\n");
+               goto anatop_probe_end;
+       }
+       ret = of_property_read_u32(np, "anatop-min-voltage",
+                                  &sreg->min_voltage);
+       if (ret) {
+               dev_err(dev, "no anatop-min-voltage property set\n");
+               goto anatop_probe_end;
+       }
+       ret = of_property_read_u32(np, "anatop-max-voltage",
+                                  &sreg->max_voltage);
+       if (ret) {
+               dev_err(dev, "no anatop-max-voltage property set\n");
+               goto anatop_probe_end;
+       }
+
+       rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage)
+               / 25000 + 1;
+
+       /* register regulator */
+       rdev = regulator_register(rdesc, dev,
+                                 initdata, sreg, pdev->dev.of_node);
+       if (IS_ERR(rdev)) {
+               dev_err(dev, "failed to register %s\n",
+                       rdesc->name);
+               ret = PTR_ERR(rdev);
+               goto anatop_probe_end;
+       }
+
+       platform_set_drvdata(pdev, rdev);
+
+anatop_probe_end:
+       if (ret)
+               kfree(sreg->name);
+
+       return ret;
+}
+
+static int __devexit anatop_regulator_remove(struct platform_device *pdev)
+{
+       struct regulator_dev *rdev = platform_get_drvdata(pdev);
+       struct anatop_regulator *sreg = rdev_get_drvdata(rdev);
+       const char *name = sreg->name;
+
+       regulator_unregister(rdev);
+       kfree(name);
+
+       return 0;
+}
+
+static struct of_device_id __devinitdata of_anatop_regulator_match_tbl[] = {
+       { .compatible = "fsl,anatop-regulator", },
+       { /* end */ }
+};
+
+static struct platform_driver anatop_regulator = {
+       .driver = {
+               .name   = "anatop_regulator",
+               .owner  = THIS_MODULE,
+               .of_match_table = of_anatop_regulator_match_tbl,
+       },
+       .probe  = anatop_regulator_probe,
+       .remove = anatop_regulator_remove,
+};
+
+static int __init anatop_regulator_init(void)
+{
+       return platform_driver_register(&anatop_regulator);
+}
+postcore_initcall(anatop_regulator_init);
+
+static void __exit anatop_regulator_exit(void)
+{
+       platform_driver_unregister(&anatop_regulator);
+}
+module_exit(anatop_regulator_exit);
+
+MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>, "
+             "Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
+MODULE_DESCRIPTION("ANATOP Regulator driver");
+MODULE_LICENSE("GPL v2");